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The speed of sound varies depending on the temperature, pressure, and density of the medium through which the sound waves travel. For dry air at sea level at 68° F, the speed of sound is 767 miles per hour, or 1235 km/h

en.wikipedia.org/wiki/Speed_of_sound

The speed of sound is the distance travelled per unit time by a sound wave as it propagates through an elastic medium. In dry air at 0 °C (32 °F), the speed of sound is 332 metres per second (1,089 ft/s; 1,195 km/h; 743 mph; ...

www.ask.com/youtube?q=What+Is+the+Speed+of+Sound+in+Miles+Per+Hour&v=llZwBVSTleI
Aug 14, 2012 ... Hypersonic X-51A X51a Wave Rider - u.s technology for future combat and commercial use (speed of sound - 1235km/hr) (speed of rifle bullet- ...

www.quora.com/What-is-the-speed-of-sound-in-miles-per-hour

At sea level, the speed of sound is 1,088/sec. Multiply per/sec by 60 (seconds in a minute) for a sum of 65,280. Multiply that by 60 (minutes in 1 hour) for a sum of  ...

convert-to.com/conversion/speed/convert-speed-of-sound-to-mi-per-hour.html

This on the web one-way conversion tool converts speed and velocity units from speed of sound ( sea level ) into miles per hour ( mph ) instantly online. 1 speed ...

www.unitjuggler.com/convert-speed-from-Ma-to-mph.html

Convert speed units. Easily convert mach (speed of sound) to miles per hour, convert Ma to mph . Many other converters available for free.

www.livescience.com/37022-speed-of-sound-mach-1.html

May 31, 2013 ... On Earth, the speed of sound at sea level — assuming an air temperature of 59 degrees Fahrenheit (15 degrees Celsius) — is 761.2 mph ...

www.indiana.edu/~emusic/acoustics/speed.htm

For comparison, the speed of light in a vacuum is 299,792,458 meters per second or 186,000 miles per second (669,600,000 mph), which is roughly 870,000 ...

www.inchcalculator.com/convert/speed-of-sound-to-mile-per-hour

Converting a speed of sound speed measurement to a mile per hour measurement involves multiplying your speed by the conversion ratio to find the result.

www.smh.com.au/technology/sci-tech/hypersonic-plane-to-fly-at-20-times-speed-of-sound-20120717-227l9.html

Jul 17, 2012 ... More. The US military aims to fly a hypersonic plane at 20 times the speed of sound by 2016. The X-plane will travel at Mach 20 (roughly 20,900 km/h), which means it could fly to any place on earth in less than an hour.